Patent US2962878A successfully refreshed from Google Patents.
Patent US1898477A successfully refreshed from Google Patents.
US1898477A
Expired / Lapsed
US
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Fading elimination
Assignee: Telefunken AG
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Filing: 1929-12-16
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Granted: 1933-02-21
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Expires: 1949-12-16
Abstract
No abstract record available.
Inventors
- 👤 Bohm Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:04
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/02; H04J; H04J9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-02-21 | 1936-08-22 | 1937-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-21 | 1940-08-22 | 1941-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-21 | 1944-08-22 | 1945-02-21 | $7700.00 | Window Closed / Lapsed |